The gzip and gunzip programs are vulnerable to a race condition
when setting file permissions (CAN-2005-0988), as well as improper
handling of filename restoration (CAN-2005-1228). The zgrep utility
improperly sanitizes arguments, which may come from an untrusted source
(CAN-2005-0758).

Impact

These vulnerabilities could allow arbitrary command execution,
changing the permissions of arbitrary files, and installation of files
to an aribitrary location in the filesystem.